Fix wrong drawing region in Digimon Re : Digitize

This fixes wrong drawing region in Digimon Re : Digitize in buffered rendering mode : #619 
however oversize OSK not yet fixed 

Tested with following games and no broken .

MotoGP 
FF type-0
FF Crisis Core
Saint Seiya Omega
Fate Extra
Dragon Ball Evolution

![1](https://f.cloud.github.com/assets/3000282/142135/d76d6c9e-72c7-11e2-9d5c-b0feed907008.jpg)